Steam-engine valve.



Willy.'

A.. D. SKINNBR (m. o. STBVBS. STEAM ENGINE v ALVB. V APPLICATION FILED SEPT. 11, 1914.

UNITED ySTATES PATENT OFFICE.

ALLAN TO SKINNER ENGIN D. SYINNER AND ROBERT C. STE

E COMPANY, F E

county of Erie and have inv ented certain new VENS, OF ERIE, PENNSYLVANIA, ASSGNOBS RIE, PENNSYLVANIA, A CORPORATION.

Specification of Letters Patent.

Patented Dec. 1, 1914.

Application filed September 11, 1914. Serial No. 861,203.

C0 2106 Til ALLAx D. SKINNER citizens of the the State of Pennsylvania, and useful 1in- Evans,

provements in -Steam-Engine' Valves, oi which the following is a specification.

This invention relates to especially' to valves applicable f the uniiow type, having a t port, and auxiliary exhaust valves, and to engines o middle exliaus steam engine ports located between the middle port and the cylinder heads,

to provide improved means for controlling` the exhaust through the auxiliary ports,

and has for its object lVhen the engine is running condensing, vacuum tends to be produced inthe cylinder during the return stroke of the piston, and the auxiliary ports may cease to operate, .but

when the engine is runnin 0 non-condensing,

it is desirable to periodically open the aux iliary exhaust pas steam after the ex sages pansion stroke.

for the escape of Therefore the present invention is designed to provide improved means auxiliary valves, which control the auxiliary ports, closed when condensing, and to ate when the engi densing,

for holding the the engine is running permit the same to operne is running non-conto avoid excessive compression, .or

tion said valves are ence and absence of vacuum in the exhaust pipe, as will more fully and in the present invencontrolled by the presappear from the following description.

In the accompanying l view of 1 is' a sectiona Fig.

the invention.

a modification.

der A, of the uni provided wit located at or about ports passage chamber shown) drawings z-Figure one embodiment of 2 is a similar view of Referring especially to Fig. 1, the cylinlow or uni-directional type h main exhaust ports B,

the middle of the cylinlled by the piston indicated X, in a manner common The cylinder also has auxiliary C located between the main h cylinder head..` A Valve controls the from the ports C to the exhaust Y which communicates-with theexhaust pipe T leading to a condenser (not The valve D is mounted on a stem A piston F is also mounted on the stem I,

and moves in a small cylinder Gr. A port H communicates from the endof the cylinder A to the chamber G. The valve stem I extends through the wall of the exhaust casing or chamber and on its outer end is preferably provided with a plate J located within a casing or housing K, in which is mounted a toggle comprising a pin L, link M, bell crank N and a roller S carried by one end of the bell crank and bearing against the plate J. T o the other end of the hell crank is connected a piston O moving in a cylinder chamber P, and saidpiston is normally advanced by spring Q. From the head of the chamber P, a pipe R- extends to the main exhaust pipe T. v

T his device operates as follows: lVlien the engine runs non-condensing, the piston X passes the ports B and the steam exhausts through said ports in `the usual manner. On the return stroke, compression would be-v gin as soon as the piston had passed the ports B, but for the fact that the valve D is held open by the spring Efand the port C is therefore opened so that the residual steam escapes through said port until the piston `cvcle, the toggle remains flexed, and the from the plate J on the by the` action of the O. Now, the

roller S held away end of the valve stem, spring Q on the piston engine runs condensing, the vacuum in the exhaust pipe T acts through' the pipe R to reduce the pressure behindthe piston O, and said piston being retracted er moved in-` wardly by atmospheric pressure overcoming the spring Q straightens the toggle and the roller S acts against the plate J. and the valve stem and closes the valve D, and holds the same closed as long as suilicient vacuum exists. If the vacuum fails, the spring Q 1i ner or upper end of which is connected ssage Hivith the enel ofthe cylinder under the piston E", tends he valve. A piate J is attached to ter enti el? the valve stein and a roller u hv' toggle il" hears on the inner "l, elf the piate J', thetoggle d tu the piston by a yoked h spans the valve stem, the h connecting pipe it being siiniiariy to the a'n'in shown A'in The operation is also similarfe'xthe valve D is opened inwardly fr mepe when in consequence the cylinderA acting H the piston F holds mi 'when the engine nan "L .og-gie is aetuated to 'fe VelL rl and inoperative. 1 he seen tl he toggle mechanism positive' Alcking mechanism for the valve shut when the engine is (i condensing. ni r* a faire 'iiuahanisni for steam eninhination 'of an exhaust valve, ineclnmfsin for said valve, and imi-ted hy reduction of pressure in pipe oftleengine :tor operating ffnismlto lock said 'valve in closed en with a steam engine n and auxiliary exhaust controlling the auxiliary a in i valve een, weperating in a chamber G', thel exhaust port, a locking mechanism for 'said valve, and 'means actuated by reduction of pressure in the exhaust pipe for operatino' ,-by vacuum in the exhaust pipe for operating said locking mechanism to hold said valve closed when the engine is runningk condensing. i

l. The combination with -a steam engine cylinder having main and auxiliary exhaust ports, of a valve controlling' the auxiliary portJ a spring tending to open said valve, a lever operative to close said valve, a cylinder y:communicating with the exhaust pipe of the engine, and a piston in the last -mentioned cylinder connected to the lever and adapted to be operated under reduction of pressure in the exhaust pipe, to hold said valve closed.

5. The combination with a steam enginey cyllnder having main and auxillary exhaust ports,' of a valve controlling the auxiliary port, a. spring tending to open said valve, a toggle acting on the valve and adapted when straightened to lock the valve closed, and means actuated by reduction of pressure in the exhaust pipe of the engine to straighten the toggle.

In testimony whereof7 we ai'x our signatures in presence of two Witnesses. v

ALLAN D.'SKINNER.' ROBERT C. STEVENS. Witnesses:

HARRY G. ADAM, HUBERT'E. COBURN.

Kem 

